Jessica Biel is nervous Justin Timberlake will cheat on her with Cameron Diaz. Cameron and Justin dated for four years and it’s rumored the reason they split was because of Jessica Biel. Cameron and Justin will co-star in Bad Teacher and have a few sizzling sex scenes.

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more Justin, Jessica and Cameron after the hop…

According to ShowbizSpy.com this has Jessica Biel mighty nervous. It’s been tough enough to keep him in check and now she’ll have to worry about him straying while at work. Sigh. Why can’t he make more movies like that Facebook one where its just him and a bunch of dudes, she’s probably lamenting.

Jessica reportedly pals that Diaz is looking “more gorgeous than ever!”

“What if old feelings come back?” she apparently said. “They’ll be working closely for weeks and weeks…and she adored him!”

But the source adds Jessica is “playing it cool and not showing her fear to Justin.”

Meanwhile, Cameron is poking holes in her Biel voodoo doll and “doing everything she can to get Justin to dump Cameron.” – We’re of course just playing!

Photos: Bauer Griffin

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